تعیین ویژگی‌های ژئوشیمیایی و ارزیابی ژنتیکی میعانات گازی با استفاده از مطالعات بایومارکری و آنالیزهای شیمی سنجی در حوضه خلیج فارس، ایران

در مطالعه حاضر به بررسی ویژگی‌های ژئوشیمیایی چهارده نمونه میعانات گازی در بخش مرکزی خلیج فارس و نواحی ساحلی این بخش پرداخته شده و همچنین با استفاده از آنالیز شیمی سنجی جهت دسته‌بندی و اختصاص حدود اطمینان، برای تعیین ژنتیکی خانواده‌های کاندنسیت در این حوضه استفاده شده ‌است. نمونه‌های مورد مطالعه از مخازن دالان و کنگان (پرمین پسین تریاس) مربوط به شش میدان گازی (میعانات گازی) که مهم‌ترین مخازن گازی ایران را تشکیل می‌دهند، جمع‌آوری شده اند. به منظور تخمین میزان بلوغ حرارتی نمونه‌ها و همچنین تعیین محیط رسوب گذاری سنگ منشا و نوع لیتولوژی آن از پارامترهای بایومارکری به دست آمده از نتایج کروماتوگرافی گازی طیف‌سنجی جرمی استفاده می‌شود. روش آماری مورد استفاده خوشه‌بندی سلسله مراتبی متراکم است که نشان می‌دهد گازهای مورد مطالعه در سه گروه ژنتیکی اصلی قرار دارند. در محدوده مورد بررسی از لحاظ بلوغ حرارتی یک روند کلی مشاهده می‌شود، به گونه‌ای که بلوغ از سمت غرب به شرق خلیج فارس و همچنین از فارس ساحلی به سمت خلیج فارس افزایش می‌یابد.

Determination of Geochemical Properties and Genetic Types of Gas Condensates Using Biomarker Studies and Chemometric Analysis in Persian Gulf Basin, Iran

Summary Comprehensive geochemical study shows the genetic relationship between 14 samples of gas condensates from the Persian Gulf. In this study, the samples were examined merely in terms of maturity, which led to a general trend towards maturation of the region. In this process, maturation increases from west to east of the Persian Gulf and also from the coastal Fars to the Persian Gulf and then to the Arabian section.   Introduction Using collected data including data biomarkers derived from gas chromatographymass spectrometry analysis. It provides relevant diagrams for maturity and source rock sedimentation environment as well as statistical analysis of existing samples for all fields. Matching the interpretations of these two to the desired results, the purpose of this Research has been achieved.   Methodology and Approaches The Samples were collected from Dalan and Kangan reservoirs (Late Permian – Triassic) from 6 gas fields (gas condensate), Which constitute the most important Iranian gas/gas condensate reservoirs. In this study, in order to estimate the maturity of the samples (for the purpose of determining the thermal maturity of gas condensates and determining their range of placement in the maturity chart), as well as determining the sedimentary environment of the source rock and type of lithology, the available biomarker parameters obtained from the results gas chromatography mass spectrometry (GCMS) were used. The statistical methods used are agglomerative hierarchical clustering (AHC) and principal component analysis (PCA), which show that the studied gases are in three main genetic groups.   Results and Conclusions According to the results of this study, the origin of hydrocarbons in the region of marine is organic matter with some organic matter of continental origin. Their maturity range is in the late stages of petroleum production and early gas window. This gas condensate is derived from the clastic lithological sources that have been generated under reducing environmental conditions and from type II and III kerogens. Three main groups of gas condensate from statistical analysis and and correlation to the source rock were identified using biomarker parameters related to maturity and sedimentation environment. The maturity from the Golshan field to the Salman field (from west to east of the Persian Gulf) increases and the sedimentary environment is different in the southern Persian Gulf Salman and Golshan fields (marine carbonate) from its northern fields such as Khayyam, Tabnak and Madar (marine shale).